code: def test_on_enviornment(self):
      self.assertTrue(
          "GOOGLE_APPLICATION_CREDENTIALS" in os.environ.keys()
      )
  
file_path: studio/tests/serving_test.py
imports: import unittest
  import subprocess
  import time
  from random import randint
  import os
  import uuid
  import requests
  from studio import model
  from env_detect import on_gcp
label_desc: Use image node_id 1 for calling the UserIndicatedOnGCPTest obj's underlying member method code with example usage: obj.test_on_enviornment() without return types